Best route to fix the exhaust rasp? - Page 2 - Ford Mustang Forum
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I just reverted back to the original stock midpipe. Even with 12" Vibrant Resonators, my Lethal Perf. offroad x-pipes were way too raspy beyond 3k rpms. The sound was too loud for me to enjoy the gains.

I'm also very interested in this XFlo muffler, curious if they inhibit power. Raided youtube and didn't find any 3.7 videos. I'm going to call Lethal Performance if they have ever recommended these.

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Get rid of the Roush mufflers, I did. Go back to stock mufflers. Add electronic adjustable cut outs to the system......Just be sure they are adjustable ones so you can control the cut out flow....Best of all worlds. Quiet in the neighborhood, full open loud at the track, mellow when cruising, but you control it. best regards Plum

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take a look at solo performance's stuff, they use muffler x's to kill rasp and j pipes to kill drone. tons of videos of v6 camaro's and v6 challengers (both 60 degree motors).

they just released a coyote exhaust, apparently planning a cyclone exhaust as we speak (ive spoken with them)

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I have BBK longtubes with catted X pipe , GT resonators and Ford Racing Sport axle backs. There is still rasp in the 3500 rpm range but other than that, the sound is awesome.
I don't think you can entirely eliminate the rasp. After all, it is a 6 cylinder, and it is, what it is.

2011 GT. Grabber Blue. Procharged. 3:73 manual.Billit LCA's. Corsa Extremes. GT 500 wheels. Racemaster DR's. T-56 Tremec. Dynotech DS . Centerforce DF. American Racing headers/high flow cats 560 rwhp.Donny Walsh tuned

2012 Pony Package. Race Red.3:31 automatic.BBK longtubes and catted X.FRPP Sport axlebacks. BBK throttle body. Dynotech DS. Brembo wheels and tires. Strut tower brace. Airraid CAI. Bama tuned.
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post #20 of 21 (permalink) Old 11-20-2013 Thread Starter
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Quote:
Originally Posted by randeez11 View Post
I have BBK longtubes with catted X pipe , GT resonators and Ford Racing Sport axle backs. There is still rasp in the 3500 rpm range but other than that, the sound is awesome.
I don't think you can entirely eliminate the rasp. After all, it is a 6 cylinder, and it is, what it is.
Good point. Honestly, I don't even think the engine is raspy even with these mufflers except for that one spot in the powerband around 3k. I love the sound everywhere else. I was hoping there was a simple solution I could drop in to mellow out that one range, but that would be too easy. I can deal with it though. Doesn't ruin the amount of fun I have with the car.

Airaid CAI, Roush axle-backs, Roush high flow upper grill, Raxiom Smoked Projector HIDs
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Quote:
Originally Posted by johnrhance View Post
Good point. Honestly, I don't even think the engine is raspy even with these mufflers except for that one spot in the powerband around 3k. I love the sound everywhere else. I was hoping there was a simple solution I could drop in to mellow out that one range, but that would be too easy. I can deal with it though. Doesn't ruin the amount of fun I have with the car.
there is a solution that simple, i posted it above.

60 degree motors are all raspy without cats. its not just ours. not like were figuring out some crazy new technology. people have been dealing with this issue for years.

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